Hummer H2. Manual - part 1836

Fig. 514: Oil Pump Pressure Relief Valve Spring 
Courtesy of GENERAL MOTORS CORP. 

6. Install a NEW regulator valve spring. 

 

2004 Hummer H2 

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

  

Fig. 515: Oil Pump Pressure Relief Valve Plug 
Courtesy of GENERAL MOTORS CORP. 

7. Install the pressure relief valve plug. 

Tighten: Tighten the pressure relief valve plug to 12 N.m (106 lb in). 

8. Inspect the oil pump for smooth operation by rotating the drive gear.  

ENGINE FRONT COVER CLEANING AND INSPECTION 

 

2004 Hummer H2 

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

  

Fig. 516: Crankshaft Front Oil Seal 
Courtesy of GENERAL MOTORS CORP. 

IMPORTANT:

z

Do not use the crankshaft oil seal again. Install a NEW crankshaft oil 
seal during assembly.  

z

Do not use the front cover-to-engine block gasket again. Install a 

 

2004 Hummer H2 

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

  

1. Remove the crankshaft oil seal (140) from the front cover.  

2. Clean the cover in solvent. Remove the sealant from the cover oil pan surface. Refer to Replacing 

Engine Gaskets . 

3. Dry the cover with compressed air.  

4. Inspect the gasket sealing surfaces for excessive scratches or gouging.  

5. Inspect the cover-to-oil pan threaded bolt holes for damaged threads or debris.  

6. Inspect the crankshaft oil seal mounting bore for damage.  

ENGINE REAR COVER CLEANING AND INSPECTION 

NEW gasket during assembly.  

CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.

 

2004 Hummer H2 

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2